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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var sList = new CopyOnWriteArrayList<Customer>();
Which of the following statements is correct?

A) The CopyOnWriteArrayList class is a thread-safe variant of ArrayList where all mutative operations are implemented by making a fresh copy of the underlying array.
B) The CopyOnWriteArrayList class is not thread-safe and does not prevent interference amongconcurrent threads.
C) The CopyOnWriteArrayList class's iterator reflects all additions, removals, or changes to the list since the iterator was created.
D) Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.
E) The CopyOnWriteArrayList class does not allow null elements.

2. Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?

A) A NullPointerException is never thrown
B) Only if assertions are disabled and the input argument isn't null
C) Only if assertions are enabled and the input argument isn't null
D) Only if assertions are disabled and the input argument is null
E) Only if assertions are enabled and the input argument is null

3. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A) C:
B) Compilation error
C) IllegalArgumentException
D) C
E) home

4. Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?

A) An exception is thrown at runtime.
B) {}
C) {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
D) Compilation fails.
E) CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}

5. Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?

A) execService.run(task1);
B) execService.execute(task2);
C) execService.submit(task1);
D) execService.call(task2);
E) execService.call(task1);
F) execService.submit(task2);
G) execService.execute(task1);
H) execService.run(task2);

Solutions: